The patch notes for version 6.07News mention that the collisions of the Sova dart are unchanged:

Sova’s Recon Bolt (E) model has been increased in size to more accurately represent its hitbox. This will not affect lineups. The collision as it travels is unchanged.

But what I've observed is that the collision has been affected. Some lineups that I never used to miss I am now routinely missing, and upon testing I've found that the hitbox of the dart appears larger for collisions, while it travels. Here's a video of me testing this change with the recon bolt. The same behavior happens with shock darts as well so expect to see your fellow Sovas missing their shockdarts more often until this is fixed, or until players adapt.